Integer overflow in Libssh2
CVE-2026-7598
A security vulnerability has been detected in libssh2 up to 1.11.1. The impacted element is the function userauth_password of the file src/userauth.c. Such manipulation of the argument username_len/password_len leads to integer overflow. The attack may be launched remotely. The name of the patch is 256d04b60d80bf1190e96b0ad1e91b2174d744b1. A patch should be applied to remediate this issue.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.008 (55.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 55.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.008 · change: +0.004
Affected products
- Libssh2
- Libssh2 — versions 1.11.0, 1.11.1
Weakness classification (CWE)
References
- github.com/libssh2/libssh2/ (Product, product)
- github.com/libssh2/libssh2/commit/256d04b60d80bf1190e96b0ad1e91b2174d744b1 (Patch, patch)
- github.com/libssh2/libssh2/pull/1858 (issue-tracking, patch, Issue Tracking)
- vuldb.com/submit/805564 (VDB Entry, Third Party Advisory, third-party-advisory)
- vuldb.com/vuln/360555 (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/vuln/360555/cti (signature, Permissions Required, permissions-required, VDB Entry)
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-7598?
- CVE-2026-7598 is a high-severity vulnerability in Libssh2, classified under CWE-189. CVSS score: 7.3/10. Published 2026-05-01.
- How severe is CVE-2026-7598?
- High severity. CVSS v3 base score is 7.3 out of 10.